1994 Olds floods with gas

[Brian D]

My 3.1 Olds emits a black cloud of smoke out of the exhaust randomly while driving. Let off and it clears up for a while but it returns. Floor it and it gets much worse.I had the fuel pressure regulator tested with a gauge connected to the fuel rail while running and revving.
It showed steady pressure. We checked the computer under history codes and found only 1 - the O2 sensor. After making some inquiries the consensus was not the O2 sensor. We cleaned the intake plenum while running it (man was it dirty) and there was no change.
I'm gonna change the plugs this weekend and see if there is any difference. I soaked all around the intake and plug wires with water ( to check for an intake leak or bad wires) while it was running and it never noticed or coughed.
Anyone out there have any ideas as to what this could be?
Stumped! Maybe a throttle position sensor?
How do you test it without replacing it?
What now?

[spidervirus]

you can take it to a shop where they have a computer to test the tps but other than that i have no idea how to test without the computer

[Brian D]

Originally Posted by Brian D

My 3.1 Olds emits a black cloud of smoke out of the exhaust randomly while driving. Let off and it clears up for a while but it returns. Floor it and it gets much worse.I had the fuel pressure regulator tested with a gauge connected to the fuel rail while running and revving.
It showed steady pressure. We checked the computer under history codes and found only 1 - the O2 sensor. After making some inquiries the consensus was not the O2 sensor. We cleaned the intake plenum while running it (man was it dirty) and there was no change.
I'm gonna change the plugs this weekend and see if there is any difference. I soaked all around the intake and plug wires with water ( to check for an intake leak or bad wires) while it was running and it never noticed or coughed.
Anyone out there have any ideas as to what this could be?
Stumped! Maybe a throttle position sensor?
How do you test it without replacing it?
What now?

Ok,I changed the plugs (they were black but not gummed up)and coolant temperature sensor and it's still doing the same thing. I can't drive it on the highway for more than 30 seconds without it starting to miss badly and then comes the black smoke again. I let off the gas then it clears up for a short time then stars all over again.What now?